CN118054453A - Distributed energy storage equipment and double-circuit access mode thereof - Google Patents
Distributed energy storage equipment and double-circuit access mode thereof Download PDFInfo
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- CN118054453A CN118054453A CN202410454655.XA CN202410454655A CN118054453A CN 118054453 A CN118054453 A CN 118054453A CN 202410454655 A CN202410454655 A CN 202410454655A CN 118054453 A CN118054453 A CN 118054453A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 107
- 230000002354 daily effect Effects 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 16
- 238000009826 distribution Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000010248 power generation Methods 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 7
- 230000003203 everyday effect Effects 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000029087 digestion Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 230000001012 protector Effects 0.000 claims description 3
- 230000000153 supplemental effect Effects 0.000 claims 1
- 238000007726 management method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000005457 optimization Methods 0.000 description 1
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- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
- H02J2310/58—The condition being electrical
- H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a distributed energy storage device and a double-circuit access mode thereof, which relate to the technical field of electric power and comprise the following components: the energy storage equipment is connected to the power grid of the station area through the low-voltage alternating-current side; the energy storage equipment comprises a low-voltage switch cabinet with a line switching function, wherein the low-voltage switch cabinet comprises two frame breakers, an electric lock is arranged between the two frame breakers, the energy storage equipment further comprises a dual-power controller and an ammeter, and the energy storage equipment is used as a functional demand side. The device can enable the equipment to be orderly switched through two lines after being connected, so that the energy storage equipment can be effectively prevented from being connected to the platform region without extra line loss when the capacity of the photovoltaic new energy is effectively increased by the platform region, and particularly when a large amount of energy is stored in a distributed mode, the device can realize the noninductive connection of the platform region, and the influence of the energy storage equipment connection on the line loss brought by the platform region can be effectively solved.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to distributed energy storage equipment and a double-circuit access mode thereof.
Background
Currently, the main energy storage equipment access modes comprise user side access, power distribution network side access, micro-grid access and new energy power generation side access. These access modes have specific application scenarios and advantages. The distributed energy storage technology is used as an excellent regional power grid resource, and is beneficial to realizing the absorption of new photovoltaic energy. However, when a large number of distributed energy storage devices are connected to a power distribution network, there are problems of small capacity, large number, uneven distribution, high single machine connection cost and the like.
In addition, the access of the energy storage equipment has positive effects on auxiliary energy elimination of the transformer, but due to the fact that the operation of the energy storage equipment is accompanied with certain energy loss, no matter which access mode is adopted, certain line loss is generated on a line, so that the power supply benefit of the line is affected, and abnormal fluctuation of the line loss of a station area is possibly caused.
For example, patent publication No. CN 116961103a discloses a distributed energy storage control method adapted to different access conditions, including a dual-grid-connected point access architecture, a dual-grid-connected point control method of the dual-grid-connected point access architecture, a cross-transformer consumption control method established based on the dual-grid-connected point access architecture, an architecture of parallel connection of transformers under a single grid-connected point, and a control method adapted to different access conditions. However, this method has the following problems: although the flexibility and adaptability of the distributed energy storage application can be improved, the access mode still generates certain line loss, so that the power supply benefit of a line is affected, and abnormal fluctuation of the line loss of a station area is possibly caused particularly when a large amount of distributed energy storage is accessed.
Disclosure of Invention
In order to solve the problems in the prior art, a distributed energy storage device and a dual-line access mode thereof are provided.
The technical scheme adopted for solving the technical problems is as follows:
The invention provides a distributed energy storage device, comprising: the energy storage equipment is connected to the power grid of the station area through the low-voltage alternating-current side; the energy storage equipment comprises a low-voltage switch cabinet with a line switching function, wherein the low-voltage switch cabinet comprises two frame breakers, an electric lock is arranged between the two frame breakers, the energy storage equipment further comprises a dual-power controller and an ammeter, and the energy storage equipment is used as a function requirement side;
frame-type circuit breaker: the frame type breaker can be used for switching on, carrying and breaking current under normal and abnormal circuit conditions;
Dual power supply controller: the dual-power controller is used for starting switching between grid power and network power or between grid power and generator power in the power grid system, and when the common power fails or fails, the power is automatically switched to the standby power through the dual-power controller;
Electric meter: the ammeter has metering function, measuring function, prepayment function, remote fee control function and freezing function, and is connected with a remote prepayment meter reading system through wireless transmission.
Preferably, the low-voltage switch cabinet is connected with a first circuit and a second circuit in parallel, the first circuit is provided with an examination table, the examination table measures daily charge and discharge of the first circuit, the second circuit is provided with a user table, and the user table measures supplementary electric energy.
Preferably, three-phase electricity is connected into the energy storage converter through the current transformer, the alternating current contactor and the alternating current breaker, and the three-phase electricity is connected in parallel to the surge protector;
The energy storage converter converts an alternating current power supply into a direct current power supply and is connected to the power supply distribution unit, one path of the power supply is divided into a direct current low-voltage line for supplying power to the control electric element in the power supply distribution unit, the other path of the power supply is a direct current high-voltage line and is connected to the batteries through the direct current circuit breaker, and the batteries form a plurality of groups of series connection modes.
Preferably, the energy storage device is connected with a first circuit and a second circuit in an alternating current mode, the first circuit is used for photovoltaic countercurrent absorption, and the second circuit is used for line loss compensation;
The charging time period of the energy storage device is as follows: when the photovoltaic power generation load of the transformer area is large and the load under the transformer area cannot be absorbed, the transformer area is manually set according to the requirement;
the line loss compensation charging time period of the energy storage device is as follows: the electricity price is manually set in the valley period or according to the need;
The discharge time period of the energy storage device is as follows: the power consumption time period or the power supply company electricity purchase price peak time period when the station area peaks or manually set according to the need;
when the ammeter monitors that the photovoltaic countercurrent is larger than the threshold value, the energy storage equipment starts to charge and consume in real time along with the countercurrent power.
Preferably, when the equipment is in a normal power supply state, the first circuit is closed, the second circuit is opened, during the period, the battery is charged in a photovoltaic digestion mode, the check meter measures the total charge quantity, and the electric power is discharged in a peak power utilization period of the power grid or a peak electricity purchase price period of a power supply company, wherein the total charge quantity is equal to the total charge quantity;
when the fact that the self residual electric quantity is insufficient and needs to be supplemented is detected, the first circuit is opened, the second circuit is closed, the energy storage device is charged, and line loss is borne by the energy storage device through register for a household residence card.
The invention also provides a double-circuit access mode of the distributed energy storage device, which comprises the following steps: two lines are respectively an L1 line and an L2 line which are both incoming lines and connected into the low-voltage switch cabinet;
The energy storage equipment daily closes an L1 line switch, by measuring a reverse current power signal below the transformer, when the photovoltaic power generation amount of a station area is larger than an electric load, the energy storage equipment starts battery charging, the charging power is equal to the reverse current power measured by a monitoring point below the transformer, when the reverse current value of the transformer acquired by the energy storage equipment is 0, the standby state that the energy storage equipment is not charged and not discharged is maintained, the reverse current power is increased, the power is reduced without reverse current, and the charging is ended when the station area has no reverse current power in a specified time period or the daily charging amount reaches a specified value.
Starting energy storage discharge at a specified time every day, wherein the discharge power is equal to the power for the load of the transformer area measured by a measuring point below the transformer, discharging is finished when the discharge electric quantity is equal to the daily charge electric quantity of the equipment, the residual electric quantity is self-detected every day by the equipment, and when the dischargeable electric quantity of the equipment is detected to be smaller than a threshold value, the equipment marks a signal;
According to the marking signal, the equipment automatically controls the frame breaker to disconnect the L1 line according to the appointed time of the day, after the equipment receives the L1 line disconnection success signal, the frame breaker is controlled to close the L2 line, the equipment receives the L2 line closing signal, the equipment is started to charge, after the charging is finished, the equipment controls the frame breaker to disconnect the L2 line, after the equipment receives the L2 line disconnection signal, the L1 line is closed, and the equipment operates normally.
Preferably, if the daily charge amount through the L1 line is greater than 175 degrees, the power is supplied through the L2 line by 35 degrees, and if the daily charge amount through the L1 line is less than 175 degrees, the power is supplied through the L2 line according to 20% of the power consumption of the yesterday energy storage device.
Compared with the prior art, the invention has the beneficial effects that:
According to the application, after the equipment is connected, the two lines are sequentially switched, so that the energy storage equipment is connected in a double-line connection mode while the capacity of absorbing new photovoltaic energy is effectively increased, the equipment loss is borne by the power storage equipment owner register for a household residence card, the line loss of the area is not additionally increased, and particularly when a large amount of distributed energy storage is connected in, the provided connection mode can realize noninductive connection of the area and effectively solve the line loss influence of the energy storage equipment connection on the area.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of the overall operation of the present invention;
FIG. 2 is an electrical topology of the present invention;
Fig. 3 is a schematic diagram of a switchgear cabinet in accordance with the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
As shown in fig. 1-3, this embodiment proposes a dual-line access manner of a distributed energy storage device, including a distributed energy storage device, where the energy storage device includes: the energy storage equipment is connected to the power grid of the station area through the low-voltage alternating-current side, and further comprises an alternating-current/direct-current power distribution system, an alternating-current/direct-current converter, a battery system, a battery management system, an energy management system, an auxiliary system with a data acquisition function, a cloud platform and an outdoor box body.
Through the arrangement, the preset system policy operation logic or cooperation with the local market scheduling management can be realized, the integration with the power supply equipment of the station area is realized, and the on-line operation management functions such as real-time data acquisition, data transmission, data storage, optimal scheduling management of electric energy, operation monitoring and the like are realized. By means of reasonable utilization of the functions, system functions such as photovoltaic local digestion, dynamic capacity increase, peak clipping and valley filling can be finally realized.
The energy storage equipment comprises a low-voltage switch cabinet with a line switching function, wherein the low-voltage switch cabinet comprises two frame breakers, an electric lock is arranged between the two frame breakers, the energy storage equipment further comprises a dual-power controller and an ammeter, and the energy storage equipment is used as a functional demand side. The electric blocking is a blocking formed by connecting auxiliary contacts of devices such as a breaker, a disconnecting switch, a grounding disconnecting switch and the like to an operation power supply circuit of related electric devices.
Frame-type circuit breaker: the frame circuit breaker may be capable of switching on, carrying and breaking current under normal circuit conditions. In addition, under the specific abnormal circuit condition, the circuit can be switched on, bear a certain time and break the current; the frame type circuit breaker is mainly used for distributing electric energy and protecting lines and power supply equipment from damage such as overload, undervoltage and short circuit.
Dual power supply controller: the dual-power controller is specifically a BQ5A dual-power controller and is used for starting and switching between grid power and network power or between grid power and generator power in a power grid system, and when the common power fails or fails, the dual-power controller automatically switches the power to a standby power supply, so that continuous supply of the power is ensured.
Electric meter: the ammeter is a 4G communication ammeter, the ammeter adopts a full-network 4G wireless transmission technology, can be connected with a remote prepayment meter reading system without a power line, has a metering function, a measuring function, a prepayment function, a remote fee control function and a freezing function, realizes data remote transmission management, and effectively reduces the installation matching cost of the meter.
Through the design and optimization, the built-in automatic dual-power switching device and strategy of the energy storage equipment are characterized in that the core is that the line loss fluctuation brought to the platform area when the energy storage equipment is accessed is reduced through the intelligent switching of dual power and the dual-power switching strategy.
In the specific implementation, the power supply of another line can be automatically judged and switched according to parameters such as current, voltage and the like monitored in real time, and the stability and reliability of power supply of the station area are ensured. Meanwhile, the energy storage equipment also has the functions of overload protection, short-circuit protection and the like, and the safety of power supply of the platform area is comprehensively ensured.
Through foretell setting, not only can promote district distributed energy storage digestion ability by a wide margin, can also avoid producing the line loss to improve district power supply's stability and reliability. Meanwhile, the device can play an important role in remote areas or areas with unstable power supply, and has the characteristics of high efficiency, stability and reliability in actual operation.
The low-voltage switch cabinet is connected with a first circuit and a second circuit in parallel, the first circuit is provided with an examination meter, the examination meter measures daily charge and discharge of the first circuit, the second circuit is provided with a user meter, the user meter measures supplementary electric energy, the examination meter is not connected with a remote prepayment meter reading system, and the user meter is installed by a power supply company after the report is installed register for a household residence card.
The access mode is specifically that the transformer is accessed at the user side and is accessed below the 400V alternating current bus of the station area. The two frame-type circuit breakers are controlled by EMS signals. In daily operation, the energy storage equipment performs orderly charging and discharging through a preset strategy of double-power switching, and the charging amount passing through the checking table every day is required to be equal to the discharging amount passing through the checking table, so that the daily charging and discharging can be ensured not to cause line loss fluctuation to the platform area.
Fig. 1 is a schematic diagram of the overall operation of the present invention, as shown in fig. 1, ac#1 is a power grid line feeding line for a cabinet body, three-phase power L1, L2, L3 is connected to a PCS line of an energy storage converter through a current transformer CT, an AC contactor AC contacto and an AC Breaker, and the three-phase power is connected in parallel to one path of the three-phase power to an SPD.
The current transformer CT plays a role in current transformation and electrical isolation, primary current is converted into more uniform secondary current, the alternating current contactor AC contactor plays a role in automatically cutting off and switching on a power supply through software control, the alternating current Breaker AC Breaker can directly cut off a line and needs to be manually switched on, an emergency insurance function is played, and the surge protector SPD can prevent lightning and earth protection and lightning stroke.
The energy storage converter PCS converts an alternating current power supply into a direct current power supply and is connected into a power distribution unit PDU, one path of the power supply is divided into a direct current low-voltage line for supplying power to control electric elements in the power distribution unit PDU, the other path of the power supply is a direct current high-voltage line and is connected into batteries through a direct current breaker, and the batteries form a multi-group serial connection mode.
The direct current low-voltage circuit is 24V and is used for supplying power to all control electric elements, and the direct current circuit breaker is used for cutting off the connection between the battery and an external power supply and needs to be manually switched on. When line loss compensation is needed, the alternating current contactor in the AC #1 line is disconnected, and the AC #2 line is subjected to line loss compensation.
The energy storage device is AC-connected to a first line for photovoltaic reverse current absorption (line AC #1 in fig. 1) and a second line for line loss compensation (line AC #2 in fig. 1).
The charging time period of the energy storage device is as follows: when the photovoltaic power generation load of the transformer area is large and the load under the transformer area cannot be absorbed, the reverse power is collected under the transformer at the moment, for example, the charging set time period is as follows: 8:00-16:00.
The line loss compensation charging time period of the energy storage device is as follows: the electricity price valley period is set to, for example, 12:00-13:00.
The discharge time period of the energy storage device is as follows: the power supply company has a peak electricity purchase price period, for example, the set time is 17:00-23:59.
The power consumption condition of the equipment is more than or equal to 0kW, when the electricity meter monitors that the photovoltaic countercurrent is more than a threshold value (the photovoltaic countercurrent is more than or equal to 0 kW), the energy storage equipment starts to charge and consume in real time along with the countercurrent power, and the power consumption control device is mainly used for reducing micro-grid fluctuation.
Table 1: circuit switching state in charge/discharge of device:
Fig. 2 is a schematic diagram of a switchgear cabinet according to the present invention: two lines are respectively L1 and L2 pulled from the bus, are both incoming lines, are connected into the low-voltage switch cabinet, and contain a frame breaker in the switch cabinet, and the frame breaker can be opened and closed remotely or automatically through strategies. One ammeter in each of the two lines is specifically an L1 meter and an L2 meter.
When the L1 line is closed, the L1 line is normally charged and discharged, and the functions of peak clipping, valley filling, photovoltaic absorption and the like can be realized. And the electricity meter meters the electricity usage and other information therein in real time. When the L1 line generates line loss and needs to be supplemented, the energy storage equipment is charged by closing the L2 line, so that the function of line loss compensation is achieved. The meter is metered by an L2 meter, and the cost is normally paid.
Fig. 3 is an electrical topology of the present invention: a recording table is arranged at the bus position below the transformer and used for recording the running state of the transformer in the transformer area, the running state is scheduled by matching with energy storage real-time communication strategies, the photovoltaic power generation is supplied to a load in a sufficient period of daytime, the residual electric quantity is stored in energy storage equipment, the charged electric quantity is recorded through the examination table, and when the photovoltaic power generation is insufficient, the energy storage releases the stored electric quantity and is supplied to the load in the transformer area for use.
The examination table records the charge electric quantity and the discharge electric quantity, and judges whether the charge electric quantity is equal to the discharge electric quantity on the same day. The energy storage can have self and circuit loss in the charge-discharge process, and through the second circuit charging, the user table records supplementary electric quantity, and the line loss that produces after energy storage equipment inserts the district electric wire netting is solved through the pay-per-view mode, so the switching-in of energy storage can not cause extra line loss for the district.
By integrating dual power switching devices and strategies within the holding facility. May be alternately connected to two power supply lines in the energy storage device. By implementing an orderly switching between the two power supply lines, the switching between the two lines in normal use and line loss compensation can be achieved.
And the running mode is automatically adjusted according to a preset strategy through the data of the total metering points, the running line is switched through the dual-power controller, and the power consumption is supplemented through the second line while the charge-discharge balance of the first line is ensured.
When self loss occurs in the use process, the dual power supply is switched to the second circuit for supplementing. And the second line is provided with a user meter for charging and paying the supplementary electric energy.
When the equipment is in a normal power supply state, the first circuit is closed through remote control, the second circuit is opened, the energy storage equipment is enabled to normally operate and achieve various functions, during the period, the battery is charged in a photovoltaic digestion mode, the assessment meter measures the total charge electric quantity, the electricity is discharged in the peak power consumption period of the power grid, and the total discharge electric quantity is equal to the total charge electric quantity.
When the self residual electric quantity is detected to be insufficient and needs to be supplemented (because of self loss), the first circuit is opened, the second circuit is closed, the energy storage equipment is charged, the line loss is borne by the power storage equipment in a register for a household residence card mode, and the electric energy supplement of the second circuit is realized.
When the distributed energy storage equipment is connected, certain line loss is brought, the line loss can lead to the loss of the transformer in the transformer area to be increased, and the loss of electric equipment to be increased. In addition, certain energy waste can be brought, the load unbalance of the power grid of the platform area can be caused, the power grid load unbalance can further influence the normal operation of power equipment, and the stability and the reliability of the power grid are reduced.
According to the application, after the equipment is connected, the two lines are sequentially switched, so that the energy storage equipment is connected in a double-line connection mode while the capacity of absorbing new photovoltaic energy is effectively increased, the equipment loss is borne by the power storage equipment owner register for a household residence card, the line loss of the area is not additionally increased, and particularly when a large amount of distributed energy storage is connected in, the provided connection mode can realize noninductive connection of the area and effectively solve the line loss influence of the energy storage equipment connection on the area.
The double-line access mode comprises the following steps: two lines are respectively an L1 line and an L2 line which are both incoming lines and connected into the low-voltage switch cabinet.
The energy storage equipment is daily closed with an L1 circuit switch, the L1 circuit switch is in a normally closed state, when the photovoltaic power generation capacity of a transformer is larger than an electricity utilization load through measuring a reverse current power signal below the transformer, the energy storage equipment starts battery charging, the charging power is equal to the reverse current power measured by a monitoring point below the transformer, when the reverse current value of the transformer collected by the energy storage equipment is 0, namely the current transformer has no power output, and no reverse discharge to the transformer caused by photovoltaic power generation exists, the standby state that the energy storage equipment is not charged or discharged is maintained, the power is increased when the reverse current power is increased, the power is reduced when no reverse current power is not provided for the transformer in a specified time period, or the charging is ended when the daily charge capacity reaches 150kWh (adjustable parameters).
Daily afternoon 17: and 00, starting energy storage discharge, wherein the discharge power is equal to the power for the load of the transformer area measured by a measuring point below the transformer, and ending the discharge when the discharge electric quantity is equal to the daily charge electric quantity of the equipment. The device self-tests the residual electric quantity every day by 00:01, and marks a signal (if the dischargeable electric quantity is more than or equal to 45kWh, the signal is not marked) when the dischargeable electric quantity of the device is detected to be less than 45 kWh.
According to the marking signal, when the day is 12:00, the equipment automatically controls the frame breaker to open the L1 line connection, after the equipment receives the L1 line opening success signal, the equipment controls the frame breaker to close the L2 line, the equipment receives the L2 line closing signal, equipment charging is started, charging power is 50kW, and charging electric quantity is 35kWh (alternative charging scheme 2: charging power is 50kW, charging electric quantity=20% of the power consumption of yesterday equipment). After the charging is finished, the equipment controls the frame breaker to open the L2 line, and after the equipment receives an L2 line opening signal, the L1 line is closed, and the equipment operates normally.
Regarding the determination of the charge amount, if the daily charge amount through the L1 line is greater than 175 degrees, the power is supplemented by 35 degrees through the L2 line, if less than 175 degrees, and the power is supplemented by 20% of the yesterday equipment power consumption through the L2 line.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. A distributed energy storage device, comprising: the energy storage equipment is connected to the power grid of the station area through the low-voltage alternating-current side; the energy storage equipment comprises a low-voltage switch cabinet with a line switching function, wherein the low-voltage switch cabinet comprises two frame breakers, an electric lock is arranged between the two frame breakers, the energy storage equipment further comprises a dual-power controller and an ammeter, and the energy storage equipment is used as a function requirement side;
frame-type circuit breaker: the frame type breaker can be used for switching on, carrying and breaking current under normal and abnormal circuit conditions;
Dual power supply controller: the dual-power controller is used for starting switching between grid power and network power or between grid power and generator power in the power grid system, and when the common power fails or fails, the power is automatically switched to the standby power through the dual-power controller;
Electric meter: the ammeter has metering function, measuring function, prepayment function, remote fee control function and freezing function, and is connected with a remote prepayment meter reading system through wireless transmission.
2. The distributed energy storage device of claim 1, wherein the low voltage switchgear is connected in parallel with a first circuit and a second circuit, the first circuit is provided with an assessment meter, the assessment meter meters daily charge and discharge of the first circuit, the second circuit is provided with a user meter, and the user meter meters supplemental electrical energy.
3. The distributed energy storage device of claim 1, wherein three-phase electricity is connected to the energy storage converter through a current transformer, an ac contactor and an ac breaker, and the three-phase electricity is connected in parallel to the surge protector;
The energy storage converter converts an alternating current power supply into a direct current power supply and is connected to the power supply distribution unit, one path of the power supply is divided into a direct current low-voltage line for supplying power to the control electric element in the power supply distribution unit, the other path of the power supply is a direct current high-voltage line and is connected to the batteries through the direct current circuit breaker, and the batteries form a plurality of groups of series connection modes.
4. A distributed energy storage device according to claim 2, wherein the energy storage device is ac-connected to a first line for photovoltaic reverse flow absorption and a second line for line loss compensation;
The charging time period of the energy storage device is as follows: when the photovoltaic power generation load of the transformer area is large and the load under the transformer area cannot be absorbed, the transformer area is manually set according to the requirement;
the line loss compensation charging time period of the energy storage device is as follows: the electricity price is manually set in the valley period or according to the need;
The discharge time period of the energy storage device is as follows: the power consumption time period or the power supply company electricity purchase price peak time period when the station area peaks or manually set according to the need;
when the ammeter monitors that the photovoltaic countercurrent is larger than the threshold value, the energy storage equipment starts to charge and consume in real time along with the countercurrent power.
5. The distributed energy storage device of claim 4, wherein when the device is in a normal power supply state, the first circuit is closed, the second circuit is opened, during which the battery is charged by means of photovoltaic digestion, the assessment meter measures a total charge amount, and the total charge amount is discharged in a peak power consumption period of the power grid or a peak power purchase price period of the power supply company, and the total charge amount is equal to the total charge amount;
when the fact that the self residual electric quantity is insufficient and needs to be supplemented is detected, the first circuit is opened, the second circuit is closed, the energy storage device is charged, and line loss is borne by the energy storage device through register for a household residence card.
6. A dual-line access method of a distributed energy storage device, wherein the dual-line access method comprises: two lines are respectively an L1 line and an L2 line which are both incoming lines and connected into the low-voltage switch cabinet;
The energy storage equipment daily closes an L1 line switch, by measuring a reverse current power signal below the transformer, when the photovoltaic power generation amount of a station area is larger than an electric load, the energy storage equipment starts battery charging, the charging power is equal to the reverse current power measured by a monitoring point below the transformer, when the reverse current value of the transformer acquired by the energy storage equipment is 0, the standby state that the energy storage equipment is not charged and not discharged is maintained, the power is increased when the reverse current power is increased, the power is reduced when no reverse current exists in the station area, and the charging is ended when the station area has no reverse current power in a specified time period or the daily charging amount reaches a specified value;
Starting energy storage discharge at a specified time every day, wherein the discharge power is equal to the power for the load of the transformer area measured by a measuring point below the transformer, discharging is finished when the discharge electric quantity is equal to the daily charge electric quantity of the equipment, the residual electric quantity is self-detected every day by the equipment, and when the dischargeable electric quantity of the equipment is detected to be smaller than a threshold value, the equipment marks a signal;
According to the marking signal, the equipment automatically controls the frame breaker to disconnect the L1 line according to the appointed time of the day, after the equipment receives the L1 line disconnection success signal, the frame breaker is controlled to close the L2 line, the equipment receives the L2 line closing signal, the equipment is started to charge, after the charging is finished, the equipment controls the frame breaker to disconnect the L2 line, after the equipment receives the L2 line disconnection signal, the L1 line is closed, and the equipment operates normally.
7. The dual line access method of a distributed energy storage device of claim 6, wherein if the daily charge amount through the L1 line is greater than 175 degrees, the power is supplemented through the L2 line by 35 degrees, and if the daily charge amount through the L1 line is less than 175 degrees, the power is supplemented through the L2 line according to 20% of the daily power consumption of the energy storage device.
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| CN116914742A (en) * | 2023-07-25 | 2023-10-20 | 广东电网有限责任公司 | Low-voltage transformer area power supply system and power supply method connected with distributed photovoltaic |
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| US20220166223A1 (en) * | 2010-03-02 | 2022-05-26 | Rajiv Kumar Varma | Multivariable modulator controller for power generation facility |
| CN111355267A (en) * | 2020-04-16 | 2020-06-30 | 南京赫曦电气有限公司 | Novel power station system integrating network loading and storage |
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